The new Impulse fins by Cressi are the ultimate choice for freedivers looking for a soft blade. These long blades feature water rails that channel water down the blade and help prevent the blades from knocking into each other when diving. These fins also come with stiff insoles that can be added into the foot pockets for greater efficiency. A steep 29 angle between the blade and the foot pocket allows for easy surface swimming. The blades can be removed from the foot pockets.